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Hi experts, I just encountered a strange error: dual regression failed already in the first stage, yielding only lots of "-nan"s in the stage1 files. I am somewhat at a loss: I checked all paths and files, everything seems ok. What could be a reason for such an error? Thanks in advance, Cornelius -- Dr. med. Cornelius J. Werner Department of Neurology RWTH Aachen University Pauwelsstr. 30 52074 Aachen Germany